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// |reftest| shell-option(--enable-arraybuffer-resizable) skip-if(!ArrayBuffer.prototype.resize||!xulRuntime.shell) -- resizable-arraybuffer is not enabled unconditionally, requires shell-options
// Copyright (C) 2021 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-arraybuffer.prototype.resize
description: >
Behavior when attempting to reset the size of a resizable array buffer to zero explicitly
info: |
ArrayBuffer.prototype.resize ( newLength )
1. Let O be the this value.
2. Perform ? RequireInternalSlot(O, [[ArrayBufferMaxByteLength]]).
3. If IsSharedArrayBuffer(O) is true, throw a TypeError exception.
4. If IsDetachedBuffer(O) is true, throw a TypeError exception.
5. Let newByteLength be ? ToIntegerOrInfinity(newLength).
6. If newByteLength < 0 or newByteLength > O.[[ArrayBufferMaxByteLength]],
throw a RangeError exception.
7. Let hostHandled be ? HostResizeArrayBuffer(O, newByteLength).
[...]
HostResizeArrayBuffer ( buffer, newByteLength )
The implementation of HostResizeArrayBuffer must conform to the following
requirements:
- The abstract operation does not detach buffer.
- The abstract operation may complete normally or abruptly.
- If the abstract operation completes normally with handled,
buffer.[[ArrayBufferByteLength]] is newByteLength.
- The return value is either handled or unhandled.
features: [resizable-arraybuffer]
---*/
var ab = new ArrayBuffer(0, {maxByteLength: 0});
var caught = false;
var result;
// If the host chooses to throw as allowed by the specification, the observed
// behavior will be identical to the case where `ArrayBuffer.prototype.resize`
// has not been implemented. The following assertion prevents this test from
// passing in runtimes which have not implemented the method.
assert.sameValue(typeof ab.resize, 'function');
try {
result = ab.resize();
} catch (_) {
caught = true;
}
try {
ab.slice();
} catch (_) {
throw new Test262Error('The ArrayBuffer under test was detached');
}
// One of the following three conditions must be met:
//
// - HostResizeArrayBuffer returns an abrupt completion
// - HostResizeArrayBuffer handles the resize operation and conforms to the
// invarient regarding [[ArrayBufferByteLength]]
// - HostResizeArrayBuffer does not handle the resize operation, and the
// `resize` method updates [[ArrayBufferByteLength]]
//
// The final two conditions are indistinguishable.
assert(caught || ab.byteLength === 0, 'byteLength');
// One of the following three conditions must be met:
//
// - HostResizeArrayBuffer returns an abrupt completion
// - HostResizeArrayBuffer handles the resize operation, and the `resize`
// method returns early
// - HostResizeArrayBuffer does not handle the resize operation, and the
// `resize` method executes its final steps
//
// All three conditions have the same effect on the value of `result`.
assert.sameValue(result, undefined, 'normal completion value');
// The contents of the ArrayBuffer are not guaranteed by the host-defined
// abstract operation, so they are not asserted in this test.
reportCompare(0, 0);
|
